Ok, so then the only way to clean a carb
with that background is with a good soaking in a carb cleaning solution. It's probably too far gone with a lacquer build up to get it cleaned any other way. It needs to soak then air sprayed out. Spray carb cleaner, carb fuel treatment cleaners are not going to give a good soaking on a lacquer build up that is hard as nails
The needle set-up without the washer under the spacer is step 3.5, it needs the washer to bring it to a full step 4. Also suggest to turn the idle adjuster in 2 full turns, then set the pilot
screw to 2.25 to 2.5 turns to start. Expect the idle to be high, especially after riding for 15, 20 min, then, at that point readjust the idle adjuster to proper idle rpm
Turning the idle adjuster in will increase the rpms
for the start up, which with the air going thru the venturi (throat) of the carb should also help to create a slightly stronger vacuum to pull fuel up thru the internal channels of the carb.
I've seen this too many times before, where a lot of people forget to use the idle adjuster and try to adjust idle strictly with the pilot screw. they work hand in hand. If the butterflys are kept too closed, there is not enough air passing thru the venturi to create the vacuum to pull fuel thru the internal passages.